Heh, "t-shirt fan" is a term we use down here for people who cheer for college teams from schools they didn't attend. Mostly used as an insult for high school dropouts who cheer for winning teams (i.e. Michigan, Alabama, etc.) and pretend like they went to that school when all they really did was buy a t-shirt. We also apply the term to pro teams we like from different regions we have no connections to, although it isn't meant to be insulting.